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11.3.
Output-Contact Descriptions
Output1:
This is a transistor output for heartbeat
signalling. The heartbeat interval can be
set in the 1-to-72-hours range.
+5
1kOhm
output voltage........4.75 to 5.25 V
output current........20 mA max
12. Heartbeat Setting
The heartbeat interval can be set by means of a rotary
switch which is accessible on the MR2003 top. Use a
small screwdriver to turn the switch carefully to the
position for the required interval (1 to 72 hours)
according to the label in the cover. For the position of
the label in the cover see illustration MR2003D with
cover and MR2003B with cover.
0
not allowed
1
not allowed
Heartbeat-switch settings
MR2003D with cover
Andrew Wireless Systems GmbH * Industriering 10 * 86675 Buchdorf * Germany *
Page 6
2
1 h
A
3
2 h
B
4
3 h
C
5
4 h
D
6
5 h
E
7
6 h
F
8
12 h
9
18 h
Position of the rotary
switch for setting of
heartbeat interval
Phone: +49 9099 69-0 * Fax: +49 9099 69-930 *
email: WIsupport.germany@andrew.com * http://www.andrew.com
24 h
30 h
36 h
48 h
In a remote control system, heartbeat signalling is a
60 h
very useful method to monitor whether the supervision
72 h
connection to a device is still alive. Without heartbeat
signalling, there would be no indication in case the
supervision connection broke down and the OMC
would show no alarm because it no longer received
any information.
For simple remote control, a standard SMS alarm
transmitter is provided. Connecting this SMS alarm
transmitter to the heartbeat signalling output will
initiate regular SMS sending to the OMC, thus,
indicating that the connection to the device is still alive
and able to report an alarm if there is one. If the
connection is down or the device is malfunctioning,
there will be NO heartbeat SMS and an alarm is
raised at the OMC.
Output2: This optocoupler output, which is signalling
User's Guide MR2003B/D
MR2003B with cover
Position of the rotary
switch for setting of
heartbeat interval
MR2003B
the operating condition, represents the same
functionality as LED1.
Collector-emitter voltage......50 V max.
Collector current..................20 mA max
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